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If ghosts can walk through doors and glide down stairs, how come they don't fall through the floor?

There is a question out there which begs a further string of thought: “If ghosts can walk through doors and glide down stairs, how come they don't fall through the floor?”
Well, a “ghost” has no body, therefore no weight, so it cannot be affected by gravity. However, there is another moving body to consider, and that is the Earth itself.
Think. A “ghost” is a concept of a human spirit with no physical existence.
This means that gravity, traction, friction, atmospheric pressure, etc. would have no effect on them. They wouldn't be able to interact with the terrestrial environment at all – no stomping, no throwing things, no ghostly sounds, no apparitions.
The earth moves at a phenomenally fast rate of speed as it circles the Sun.
A “ghost” would be left behind in space in a matter of minutes as the Earth passed through its non corporeal form.
How fast does the Earth move through space?
The average distance from the Earth to the Sun is about 149,597,890 km. So in one year the Earth travels a distance of 2Pi(149,597,890) km. That makes the velocity about:
velocity = 2Pi(149,597,890) km/1 year
Divide that down by 365 days in a year, and 24 hours per day, you get:
velocity = 107,300 km/h or 67,062 miles per hour.
At 67,062 miles per hour a ghost would have little time to do anything except watch the earth moving away from it in space at a phenomenal rate of speed. You wouldn't be able to see, hear, or interact with any “ghost” because it would get left behind in space. If the “ghost” occupies a fixed point on a XYZ axis relative to a fixed point in space, then the Earth moves away from that point at almost 67,100 mph.
Think about how fast a car racing past you at a hundred miles/hour is moving, and how it is near impossible to see anything of the car except a blur. At almost 67,100 mph the ghost couldn't see or hear anything, nor could anyone see or hear it.
Don't kill me please! xD

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